[rubygems/rubygems] Add a gem attr to the Gem::Package class.

https://github.com/rubygems/rubygems/commit/5b81f364ae

lib/rubygems/package.rb

@@ -99,6 +99,11 @@ class Gem::Package
 
   attr_reader :files
 
+  ##
+  # Reference to the gem being packaged.
+
+  attr_reader :gem
+
   ##
   # The security policy used for verifying the contents of this package.
 

test/rubygems/test_gem_package.rb

@@ -1093,6 +1093,11 @@ class TestGemPackage < Gem::Package::TarTestCase
     assert_equal @spec, package.spec
   end
 
+  def test_gem_attr
+    package = Gem::Package.new(@gem)
+    assert_equal(package.gem, @gem)
+  end
+
   def test_spec_from_io
     # This functionality is used by rubygems.org to extract spec data from an
     # uploaded gem before it is written to storage.